I liked your story. You need to work on your paragrah structure a little, but it was very readable. The word you are looking for is Circumference. 6" in diameter is about the size of a volley ball. Keep writing

Reading your story..triggered my own story...If you like to read it, It is called (the prom night) it is in the wife catigory, same has yours...by the way I gave yours a 10, because if you read mine you will see why....Thank You!!!
Doc